Verify or re stripe Western Digital drive

Hi guys
I recently bought a Western Digital 1TB Studio Edition drive which worked a treat until I passed it on to an Avid editor to place some files onto it for my Final Cut. He ran it of an Avid PC, couldn't see any of my files and decided (stupidly) to re format the drive to Windows NT (NTFS). Now I cant delete any of the files he placed off it, re format, or verify the drive back to MAC OS as Disk utility does not allow me to do anything with it as its protected somehow. Could someone out there please help me before a throw the now expensive 'door stop' at him.
many thanks

HI,
*"as Disk utility does not allow me to do anything with it as its protected somehow."*
Run disk utility and repair disk permissions with the external drive connected to your Mac.
Launch Disk Utility. (Applications/Utilities) Select MacintoshHD in the panel on the left, select FirstAid, then click: Repair Disk Permissions. Quit DU when it's finished and reboot.
Now relaunch Disk Utility and see if the drive shows up on the left side of the window and isn't greyed out.
Carolyn

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